Paper calender



Dec. 5, 1961 A. s. RADTKE l-rrAL PAPER CALENDER Sheets-Sheet l Ill l HIM 21PM/fe Q @Ka/@ske Dec. 5, 1961 A. s. RADTKE ETAL 3,011,431

PAPER CALENDER Filed Oct. 5, 1960 2 Sheets-Sheet 2 United States Patent A O v3,011,431 PAPER CALENDER v Anton S. Radtke and Walter t). Delrarske, Wisconsin Rapids, Wis., assignors to Consolidated Water Power &

Paper Company, Wisconsin Rapids, Wis., a corporation of Wisconsin c Filed Oct. 5, 1966i, Ser; No. 60,729 4 Claims. (Cl. 10G- 162) This invention relates to improvements in paper calenders, and more particularly to the provision of breaking means for auxiliary rolls in a supercalender.

As is known, paper calendering devices of the class described comprise a vertically disposed stack of calender rolls carried by and between a pair of standards or frames, the rolls being in frictional engagement with one another and under compression through, for example, hydraulic means exerted against the Yuppermost roll" of the stack, the lowermost roll of the stack being driven.

Calendering devices of this class further comprise a number of spaced, freely rotatable auxiliary rolls carried by and between the standards on bothsides of the calen-A der stack, some of these rolls being designated as fly rolls, the paper web passing around them in its passage to and between or from the nips of the calender rolls,

the main purpose of these y rolls being to vbreak up' tracking and to let out air to prevent bubbles from forming which might adversely affect the calendering operation and the quality of the paper.

l In addition to the ily rolls, the assemblyfcaninclude several added rolls designated as spread rolls whichl act as tensioning devices and lie over the paper'web 'in its passage, at several places, between the fly rolls Vand the calender rolls. When for any reason it is desired to stop operation of the calender rolls, as for example when a break in the` paper passing therethrough occurs, and it is necessary to rethread the paper through the calender, rotation of the calender rolls quickly terminates upon stoppage of the power supply to the lowermost driven roll, the remaining rolls in the calender stack coming quickly to rest under friction. This, however, is not true with respect to the aforesaid ily and spread auxiliary rolls. On the contrary, these rolls, which are spaced from each other and from the calender rolls, continue to rotate freely Mice view partly in section of the brake means of the present invention; and

FIG. 4 is a fragmentary detail View on the line 4-4 of FIG. 3.

Referring to the drawings, the reference numeral 10 indicates one of an opposed pair of standards or side frames between which a vertical stack of calender rolls generally designated as 11 is mounted, these rolls 11 being journaled in mountings 12 slidably received in the slideway 13 in the standard 10. The lowermost roll 14 in the calender stack is driven in a suitable manner by means not shown, and the stack is maintained under compression through hydraulic means exerted in the uppermost roll 15 as diagrammatieally indicated at 16. rThe paper web 17 to the supercalender enters the calender stack at the top over the guide roll 18 and the uppermost calender roll l5.

After the paper passes between the nip` of roll 15 and the lower adjacent calender roll, and before it enters the next lower nip, it is caused to pass over a iiy roll19 and beneath a spread roll 20. Although the paper in its passage from one calender stack nipl to the other is in each case passed over a ily roll 19 to prevent formation of bubbles and to prevent entrapping of air, a lesser number of spread or tensioning rolls Ztl is adequate.

The fly rolls 19, as will be apparent, are disposed in two vertical rows, one on each side of the calender stack, and are freely endwise journaled in bearing mounting means 21, the mounting means being vertically'ad`.

` in mounting members Z3 vertically adjustable in slidefor a considerable period of time vafter termination of y the rotation ofthe calender rolls. A I, p

These auxiliary rolls Yare conventionally ofVa-highly polished steel surface character and it is diiiicult to tell by visual inspection whether they are still rotating or not. As a result, injury to workmen has often occurred on attempts to rethread a calender prior to stoppage of rotation of these auxiliary rolls.

It is therefore an object of the present invention to provide positive mechanical means for stopping rotation of the aforesaid auxiliary rolls when desired, and in a unitary manner, as for example after a reel of paper has been fed through the supercalender, and to facilitate the rapid threading through of a fresh reel or for rethreading after a break has occurred, or for any other purpose.

Other objects of the present invention relate to its details of construction, arrangement of parts, and economies thereof, as will be apparent from the following specication and accompanying drawings, wherein:

FIG. 1 is a diagrammatic sectional elevational view of a paper supercalender embodying the present invention.

FIG. 2 is a relatively enlarged, fragmentary detail view of the brake means of the present invention.

FIG. 3 is a relatively enlarged, fragmentary detail ways 24 in the standard 1), these slideways 24 being parallel to the slideways 22.

As shown in the detail views of FIGS. 2-4, the fly roll mounting means 2l (whichis tofbe considered representative of spread roll mounting means 23) is in ac-v cordance with the present invention provided with a bracket such as, for example, an L-shaped member 2S which is secured thereto as at 25'. The horizontal cornponent of the bracket 25 is formed with a pair of dependent, spaced lugs 26, 26 between whichk there is piv-l otally engaged, as by means of the rivet 27,"the lever arm 28. Pivotally secured to the arm 28, as at Z9, is the arcuate brake Shoe 30 by means of the radially pro,-

jecting lugs 31, 31, it being understood that the brake shoe 30, when so designated herein, includes friction;

The brake means become effective against the auxiliary rolls by downward pivoting of the outer ends of the lever arms 2S, each of which, on one side ofthe calender stack, is commonly attached to tie rod means 33, suitably in a pivotal manner, as at 34, 34. In other words, braking movement of the lever arms 28 is effected through tie rod means 33 by downward movement of the tie rod in a suitable manner. As illustrated, the brake setting means comprisesfthe air line 35 controlled by the valve 36 leading to the cylinders 37, the cylinders being suitably pivotally mounted as at 38 on the arm 39 mounted on the base 40.

The air under pressure led into the cylinder 37 causes projection of the piston means 4i, which at its outer end is pivotally engaged as at 42 to the link 43. The outer end of link -43 is pivotally engaged as at 44 to the lower terminal component of tie rod means 33 and fulcrumed `at the pivot 45 carried by the arm 45. Thus, application or" air through the line 35 causes the link 43 pivoted at 45 to move the tie rod and its associate lever arms 28 in a downward direction to cause application of the associated brake shoes 32. Upon release of the air pressure the brakes are released through the action of 3 spring member 47 extending between the base 40 and the link 43 to reverse the pivoting action of the link 43.

Although the brake means shown in the detail view of FIG. 3 employs a lever arm 28 pivoted at its opposed ends, one end being pivoted to the tie rod 33 and its opposed end to the bracket with the brake shoe 35i pivotally engaged intermediate said ends, whereby downward movement of the outer end of the arm 28 causes frictional engagement of the shoe on an upper peripheral portion of a fly roll `19 or of a spread roll Ztl, as viewed in FIG. 1, as will further appear from FIG. l in several instances a brake shoe acts upwardly against a lower peripheral portion of the rolls 19 as viewed in FIG. 1. In these instances, the operation, construction and arrangement of the brake means is substantially that previously described with respect to FIG. 3, with the exception that these lever arms 28', while being engaged at their outermost ends to the tie rod 33 similar to the lever arms 28, carry the brake shoe in pivotal engagement at the end as at 29', with the -fixed bracket 25 in pivotal engagement with the arm 28 intermediate its ends as at 27.

Thus, when the outer ends of the lever arms 28 by their association with a tie rod 33 are pivoted downwardly, their associate brake shoes 30 are also caused to be pivoted downwardly into frictional engagement with the associated auxiliary roll, and at the same time the lever arms 218 which are also associated at their outer ends With the tie rod 33 cause their associated brake shoes to be moved upwardly in frictional engagement with an adjacent auxiliary roll. In this manner an operator can quickly bring all auxiliary rolls to a stop when freely rotating.

Although we have shown and described the preferred embodiment of our invention, itvwill be understood that changes may be made in the details thereof without departing from the scope of our invention as defined by the appended claims.

We claim:

1. In a paper calender, an opposed pair of standards, a vertically disposed stack of calender rolls carried by and between said standards, a plurality of spaced freely rotatable auxiliary rolls carried by and between said standards and disposed laterally of said calender rolls, and friction brake means effective against said auxiliary rolls comprising separate brake shoes disposed adjacent each of said auxiliary rolls and means for jointly applying said brake shoes.

2. A paper calender comprising an opposed pair of standards, a vertically disposed stack of calender rolls in frictional engagement with each other carried by and between said standards, one of said calender rolls being driven, a plurality of vertically spaced auxiliary rolls carried by and between said standards disposed laterally of said calender rolls and freely rotatable by the paper Web passed between the nips off the calender rolls and friction brake means effective against said auxiliary rolls yfor quickly stopping free rotation when out of contact with a moving paper web, said brake means comprising separate arcuate brake shoes disposed adjacent each of said auxiliary rolls and means `for jointly applying said brake shoes.

3. A paper calender comprising an opposed pair of standards, a vertically disposed stack of calender rolls in frictional engagement with each other carried by and between said standards, one of said rolls being driven, a plurality of vertically spaced auxiliary rolls carried by and between saidv standards disposed late-rally of the calender rolls in two spaced groups and freely rotatable by a paper web passed between the nips of the calender rolls and friction brake means effective against said auxiliary rolls, said friction brake means comprising an arcuate brake shoe disposed adjacent each of said auxiliary rolls, a lever arm in pivotal engagement with said shoe, means pivotally supporting said lever on one of said standards, and a spaced pair of vertically reciprocable tie rod means secured to said lever arms for jointly applying said brake shoes to said auxiliary rolls.

4. A paper calender comprising an opposed pair of standards, a vertically disposed stack of calender rolls in `frictional engagement with each other carried by and between said standards, one of said rolls being driven, a plurality of vertically spaced auxiliary rolls carried by and between said standards disposed laterally of the calender rolls in two spaced groups and freely rotatable by a paper web passed between the nips of the calender rolls and friction brake means effective against said auxiliary rolls, said friction brake means comprising bracket means carried by one of said standards adjacent the one end of each auxiliary roll, a generally horizontally extending lever arm in pivotal engagement with each bracket, and an arcuate brake shoe pivotally carried by each lever arm, a spaced pair of vertically reciprocable tie rod means, one engaged to each of the lever arms in separate roll groups, and means for jointly moving said tie rods to jointly move their associated lever arms about their respective pivots and to jointly bring their associated brake shoes into peripheral braking engagement with said auxiliary rolls.

References Cited in the le of this patent UNITED STATES PATENTS 2,058,352 Putnam Oct. 20, 1936 

